diff --git a/libs/evoral/src/Curve.cpp b/libs/evoral/src/Curve.cpp
index b59d4735bf..b1150049d8 100644
--- a/libs/evoral/src/Curve.cpp
+++ b/libs/evoral/src/Curve.cpp
@@ -257,7 +257,7 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 		double frac = (x1 - max_x) / (x1 - x0);
 		
 		cerr << "compute subveclen from " << original_veclen << " * " << frac
-		     << " taken from " << x0 << " .. " << x0 
+		     << " taken from " << (int64_t) x0 << " .. " << (int64_t) x0 
 		     << endl;
 
 		int64_t subveclen = (int64_t) floor (original_veclen * frac);